c. 1757 CE
The sextant improves angular observation at sea
Oceans, navigation & cartography · Instruments & positioning · Ocean navigation
Adapted from the octant in the mid-eighteenth century, the sextant enabled accurate measurement of the angle between a celestial body and the horizon from a moving deck. Together with almanacs, calculation, and chronometers it improved position finding; the instrument alone did not solve navigation.
Precision, calendar, and review
- Start
- year · approximate
- Calendar and convention
- Historical-era years; the source calendar is not identified. No conversion of days is assumed.
- Year zero
- The scale goes from 1 BCE to 1 CE without year zero. Changing era names changes labels only.
- Documentary review
- Date not recorded
Reading the date: point event.
Sources
- www.musees-langres.fr (opens in a new tab)
Source provenance and scope
- Publication date
- Not identified in metadata; document review pending
- Bibliographic date checked
- 2026-09-23
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